About Biojack
Biojack Oy is a Finnish forestry-attachment company based in Perniö. Its product range covers multifunctional tree shears, saw grapples, combi grapples and harvesting heads for energy-wood harvesting, thinning and tree care. Biojack states that the grapples are manufactured by Nummek Oy in the same premises, with the two companies cooperating closely on product development and production.
What does Biojack manufacture?
- Tree shears for energy wood and controlled felling
- Saw grapples for cutting and holding stems
- Combi grapples for multi-purpose handling
- Harvesting heads for mechanised thinning and energy-wood work
- Extension booms and accessories for selected carrier setups
Machines and applications
Biojack has offered an excavator series since 2010 and supplies products for carriers ranging from small machines to heavier excavators and forestry equipment. Different tools use different cutting methods, so the suitable product depends on whether the priority is simple felling, holding and sectioning, or full harvesting and feeding.
Company and brand structure
Biojack Oy is the product company; official Biojack information identifies Nummek Oy as the manufacturer of the grapples in the same Finnish premises.
Choosing Biojack equipment
Check cutting or saw capacity, grapple opening, attachment mass and hydraulic functions. For harvesting heads, add feed and measuring-system requirements. When working at long reach, calculate the weight of the retained tree section as part of the machine’s lifting case, not just the attachment’s own weight.
Product range in context
The Biojack attachment range includes tree shears, grapple saws, harvester heads, and grapples. Typical applications include forestry and tree care and land clearing and vegetation management. Compatibility depends on the exact attachment model, carrier size, mounting interface, hydraulic system and intended duty cycle. Compare the relevant product family first, then verify model-specific dimensions, weight, oil flow, operating pressure and control requirements for the machine and job.
What to compare within the Biojack range
Within the Biojack range, specifications differ by product family. Compare the main dimensions, carrier requirements, hydraulic demands and working limits shown below before treating two models as direct alternatives.
| Product area | Typical role | Key specification checks |
|---|---|---|
| Tree shears | Cutting and handling trees or heavy vegetation. | Cutting diameter, grab geometry, rotator or tilt setup, service weight and carrier hydraulics. |
| Grapple saws | Handling and cutting timber in one work cycle. | Grapple opening, saw configuration, cutting capacity, rotator setup and hydraulic supply. |
| Harvester heads | Felling, delimbing and processing trees. | Tree size range, feed system, delimbing knives, measuring system, carrier hydraulics and control integration. |
| Grapples | Sorting, loading and material handling. | Jaw geometry, opening, volume, rotator interface, service weight and hydraulic functions. |
Where Biojack products fit
Biojack equipment can be configured differently depending on the job. Application-specific geometry, wear protection, hydraulic demand, working reach and carrier balance should be considered alongside the headline attachment type.
- Forestry & tree care: tree size, cutting or gripping capacity, rotation, hose routing and the carrier hydraulic system determine practical suitability.
- Land clearing & vegetation management: vegetation diameter, cutting method, guarding, reach and carrier stability should be considered together.
Compatibility and installation checks
For Biojack products, relevant carrier types include excavators, mini excavators, forestry machines, and tractors. A technically compatible attachment still needs to fit the machine, coupler and hydraulic system as a complete installed package. Compare mounting dimensions, operating weight, hydraulic flow and pressure, hose routing and any required electrical or control interfaces before ordering.
- Carrier operating weight and the carrier manufacturer’s permitted attachment mass.
- Available hydraulic flow, working pressure, return-line requirements and the number of auxiliary circuits.
- Control-system, electrical or sensor compatibility where the attachment uses integrated functions.
- Overall attachment height, working envelope, transport dimensions and hose routing.
Service, wear parts and ownership
Purchase price is only one part of attachment cost. When evaluating Biojack, check access to pins, bushings, cutting edges, teeth, tines and other mechanical wear points and cutting, crushing or drilling wear parts and the time required to replace them. Also compare parts availability, service documentation, dealer support and the practicality of carrying critical wear items on site. For high-hour attachments, small differences in maintenance access and parts lead time can matter more than a minor difference in initial price.
Information to prepare before requesting a quote
For a useful quotation on tree shears, grapple saws, harvester heads, and grapples from Biojack, provide the carrier make and model, operating weight, year if relevant, coupler or pin dimensions, available hydraulic flow and pressure, and a short description of the material or job. Include the required working width, capacity, cutting size or other task-specific target where applicable. This reduces the risk of comparing prices for attachments that are not actually equivalent.
Explore related attachment topics
Official sources
For Biojack, use current technical documentation, manuals and authorised dealer information to confirm model availability and exact carrier compatibility before ordering.